Hsiang-Yu Huang
I model this DAC-driven measurement few months ago (alog63453). Currently we replace the whitening filter with 524 kHz ADC path. (LHO:66974) and also take measurement again. (LHO:66989).
Data used are stored in (LHO:67154)
Result
The gain of this measurment in 1 kHz is ~3.08e-6 [mA/ADC cts]
Comparison
Comparison between data, model and the model with time delay
Time delay(TD) with model here I assumed is 1.58e-4 seconds to fit the phase trend.
Extra plots:
Both of them are produced by pyDARM. Conifiguration file here I used is the parameter updated in 25/01/2023 before new run of whitening filter transfer function charactization.
Second picture: make a plot for the path from TIA to ADC, and compensation filter in IOP model.
Third picture: make freq. vs. magnitude plot for the path from EXC to AI before TIA. Component is digital AI, DAC and analog AI
Hsiang-Yu Huang
I updated the parameters from pydarm_modelparams_PostO3_H1_20230125.ini with new run of whitening filter charactiztion in LHO:67110
Then compute the model again.
Comparison:
The attachment comparison plot is similar with prevoius one.
Hsiang-Yu Huang
I correct the analog and digital AA/AI filter I used in configuration file. The changes is L1aa.mat -> H1aa.mat
The attachment is updated plot.
In high frequency region, the model get closed to the measurment.
